CN201366439Y - Independent water supply system for hot-rolled high-pressure water pump station - Google Patents

Abstract

The utility model is an independent water supply system for a hot-rolled high-pressure water pump station, which consists of a single centrifugal water supply pump (1) located in the public and auxiliary water treatment pump station, an independent water supply main pipe (2) and a secondary overflow The device consists of: the centrifugal water supply pump is connected to the hot-rolled high-pressure water pump station through the water supply main pipe (2); the secondary overflow device is arranged at the entrance of the hot-rolled high-pressure water pump station, and the device is provided with two pipe diameters that meet the overflow requirements The branch water pipes (3) are equipped with a water supply pressure regulating valve (4) and manual butterfly valve (5) on each branch water pipe; the two branch water pipes are welded at intervals near the entrance where the water supply main pipe enters the hot-rolled high-pressure water pump station They are all connected to the nearby slag-washing iron ditch (6). The utility model can effectively realize the stable supply of high-pressure water in the rolling line without being affected by the change of other non-high-pressure water consumption in the rolling line, and can ensure timely and accurate water supply regulation and realize effective protection of the corresponding water supply pump of the water treatment system .

Description

Independent water supply system for hot rolling high pressure water pump station

technical field

The utility model relates to the field of water supply, in particular to an independent water supply system for a hot rolling high-pressure water pump station.

Background technique

For hot rolling production, high-pressure descaling water is a complex system. Stable water pressure at the descaling point of the rolling line can achieve a good and expected slab descaling effect. If a large amount of cooling water (such as roll cooling and strip cooling, etc.) in the station and other parts of the rolling line is mixed with water, then when the non-high-pressure water consumption in other parts of the rolling line is large, the water supply to the high-pressure water pump station will be reduced. Instability, which affects the high-pressure water supply of the high-pressure water pump station to the rolling line; in addition, the mixed water supply system of the external water treatment to the rolling area also makes the design of the overall overflow system complicated and difficult to be accurate.

Contents of the invention

The technical problem to be solved by the utility model is to provide an independent water supply system for the hot-rolling high-pressure water pump station, so as to effectively realize the stable supply of high-pressure water for the rolling line, and at the same time realize effective protection for the corresponding water supply pump of the water treatment system.

The technical solution adopted by the utility model to solve the technical problem is: it is composed of a single centrifugal water supply pump, an independent water supply main pipe and a secondary overflow device. Among them: the centrifugal water supply pump located in the public and auxiliary water treatment pump station, which is connected to the hot-rolled high-pressure water pump station through the water supply main pipe; the secondary overflow device is set at the entrance of the hot-rolled high-pressure water pump station. A water supply pressure regulating valve and a manual butterfly valve are installed on each branch water pipe; the two branch water pipes are welded on the pipe near the entrance of the water supply main pipe into the hot-rolled high-pressure water pump station at intervals. To the nearby slag-washing iron ditch.

The working principle of the utility model is: for the hot-rolling high-pressure descaling water, in order to ensure the stable high-pressure water of the rolling line, a stable water supply adjustment of the high-pressure water pump station is required, and the independent and stable water supply of the external water treatment system is beneficial to the high-pressure water pump. The station realizes water supply regulation. When the high-pressure water consumption of the rolling line decreases, the water pressure in the pipeline increases. At this time, the pressure regulating valve is automatically opened to release part of the excess water supplied to the high-pressure pump station to maintain the basic operation of the motor of the high-pressure pump station; and only when the pressure in the pipeline drops to slightly When it is greater than the normal water supply pressure, close the pressure regulating valve to realize normal pressure water supply. In this way, the protection of water supply pumps and pipelines for water treatment can be realized under the condition of maintaining a certain reserve water volume and pressure for the high-pressure water pumping station. When it is necessary to overhaul and maintain the corresponding branch pipelines and pressure regulating valves, it can be realized through the additional manual butterfly valve.

Compared with the prior art, the utility model has the following main advantages:

Separate the water supply from the external water treatment system to the high-pressure water pumping station of the rolling line from the mixed water supply system, and independently supply water to the high-pressure water pumping station, which can effectively realize the stable supply of high-pressure water in the rolling line without being affected by other non-high-pressure water in the rolling line The impact of changes in usage.

According to the high-pressure water usage system of the rolling line, it is reasonable to set up a secondary overflow regulation system at the entrance of the high-pressure water pump station of the independent water supply pipeline. Since the pipeline only has high-pressure water, the influencing factors are relatively single compared with the existing mixed water supply system. , so it can ensure timely and more accurate water supply regulation and realize the effective protection of the corresponding water supply pump of the water treatment system.

This system can make the high-pressure water descaling effect of the rolling line better, thereby further improving the surface quality of the strip steel, increasing the yield, and can produce good economic benefits. It is easy to be adopted in the future hot rolling engineering design because of the minimal investment.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. centrifugal water supply pump; 2. main water supply pipe; 3. branch water pipe; 4. water supply pressure regulating valve; 5. manual butterfly valve;

Detailed ways

The structure of the independent water supply system for the hot-rolling high-pressure water pump station provided by the utility model is shown in Figure 1: it consists of a single centrifugal water supply pump 1, an independent water supply main pipe 2 and a secondary overflow device. Among them, the centrifugal water supply pump 1 is located in the public and auxiliary water treatment pumping station. The water supply pump supplies the descaling water to the hot rolling high-pressure water pumping station at low pressure through the water supply main pipe 2 (the pipe diameter is calculated according to the water supply volume). The water quality is turbid ring water, the pressure It is 0.5-0.6MPa, and the water supply temperature varies with the normal temperature water of each factory. In winter, it is generally room temperature water less than 35°C, and in summer it is cooled water (25-35°C). The secondary overflow device is set near the entrance of the hot-rolled high-pressure water pump station. The device is equipped with two branch water pipes 3 with a pipe diameter meeting the overflow requirement, and a water supply pressure regulating valve 4 and a manual butterfly valve 5 are installed on each branch water pipe. . Two branch water pipes 3 are welded at an appropriate distance (about 5 to 10 meters) on the pipeline near the entrance where the water supply main pipe enters the hot-rolled high-pressure water pump station. The drain pipe mouth 7 at the slag-washing iron ditch 6 is an enlarged trumpet-shaped pipe mouth. The hot-rolling high-pressure water pumping station is equipped with a pump 8 .

The water supply pressure regulating valve 4 adopts a self-operated sleeve pressure regulating valve, and its selection should meet the opening and closing requirements in the content of the above invention, and it needs to meet the requirements of frequent switching and regulating actions (about 700-800 times/day), fast response, and fatigue resistance. , Corrosion resistance and wear resistance requirements, for example, the self-operated sleeve pressure regulating valve model ZZYMB-25K, or other types of self-operated sleeve pressure regulating valves can be selected.

The manual butterfly valve 5 should be used for inspection and maintenance of this section of the overflow branch pipeline, and its pipe diameter specification should meet the overflow displacement. For example, a manual butterfly valve with a diameter of DN250 can be used.

While the utility model realizes the independent supply of water for the hot-rolling high-pressure water pumping station, the two water supply pressure regulating valves adopted can be opened and closed in real time according to the pressure change in the independent water supply pipeline according to the following method: when the increase value of the water pressure in the pipeline reaches the water pressure When dealing with half of the maximum allowable fluctuation range of the centrifugal water supply pump, open a water supply pressure regulating valve to realize partial overflow; if the water pressure in the pipeline continues to increase, when the pressure increase value reaches the maximum allowable fluctuation range of the water treatment centrifugal water supply pump, Then the other water supply pressure regulating valve is also opened to realize most of the overflow; only when the water pressure in the pipeline is reduced to 1.1 times the normal water supply pressure, the two water supply pressure regulating valves are closed at the same time to realize normal pressure water supply.

Below, the utility model is further described by taking the hot-rolling plant of Japan Steel as an example, but the utility model is not limited.

The public and auxiliary water treatment pump station adopts a single centrifugal water supply pump 1 (water supply capacity is 1800m ³ /h), through an independent water supply main pipe 2 made of carbon steel (calculated according to the water supply capacity of 1800m ³ /h) The water for descaling is supplied to the hot-rolling high-pressure water pump station through the underground water pipe corridor at low pressure.

Near the inlet main pipe of the hot-rolled high-pressure water pump station, two branch water pipes 3 made of carbon steel with a diameter of DN250 are welded at an appropriate distance (about 5-10 meters), and both are connected to the flushing slag near the hot-rolled high-pressure water pump station. There are 6 places in the iron ditch, and the outlet 7 of the drain pipe entering the slag-washing iron ditch is made into an enlarged trumpet shape to reduce the vibration of the pipeline during pressure relief; a self-operated sleeve pressure regulating valve (ZZYMB-25K) is added to each branch water pipe ) and a 10 kg manual butterfly valve with a diameter of DN250;

When the pressure in the branch water pipe reaches 0.65MPa, a self-operated sleeve pressure regulating valve will be automatically opened to release part of the excess water supplied to the high-pressure pump station. When the pressure increase reaches 0.7MPa, another self-operated sleeve pressure will The regulating valve is also automatically opened to realize large flow overflow. And only when the pressure in the pipeline drops to 0.6MPa, the two self-operated sleeve pressure regulating valves are closed at the same time to realize normal pressure water supply.

Claims (5)

1. An independent water supply system for hot-rolled high-pressure water pumping stations, which is characterized by a separate centrifugal water supply pump (1), an independent water supply main pipe (2) and a secondary overflow device, wherein: located The centrifugal water supply pump (1) in the public and auxiliary water treatment pumping station is connected to the hot-rolling high-pressure water pumping station through the water supply main pipe (2); the secondary overflow device is set at the entrance of the hot-rolling high-pressure water pumping station. For branch water pipes (3) of the pipe diameter required for overflow, a water supply pressure regulating valve (4) and a manual butterfly valve (5) are installed on each branch water pipe; On the pipeline near the entrance of the water pumping station, they are all connected to the nearby slag washing ditch (6). 2. The independent water supply system for the hot-rolling high-pressure water pumping station according to claim 1, characterized in that: the water supply pressure regulating valve (4) adopts a self-operated sleeve pressure regulating valve. 3. The independent water supply system for the hot-rolling high-pressure water pumping station according to claim 2, characterized in that: the self-operated sleeve pressure regulating valve has a model of ZZYMB-25K. 4. The independent water supply system for the hot-rolling high-pressure water pump station according to claim 1, characterized in that: the manual butterfly valve (5) has a diameter of DN250. 5. The independent water supply system for the hot-rolled high-pressure water pumping station according to claim 1, characterized in that: the two branch water pipes (3) enter the drain pipe mouth at the place where they enter the slag washing ditch (6) (7) It is an enlarged trumpet-shaped nozzle.

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